CSS Menu does not display correctly in IE but looks great in FireFox and Chrome

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CSS Menu does not display correctly in IE but looks great in FireFox and Chrome

I created a menu that looks great in Chrome and in Firefox.
When I view it in IE 9 or 10 the menu has a completely different look (I do not have IE8)
The seond series of menu options should fall straight down under the first row with no cascading of buttons like they do in FireFox or in Chrome.
In IE they move to the right significantly. Also it adds ugly padding between each menu option.